Shinjiteita Nakama-tachi ni Dungeon Okuchi de Korosarekaketa ga Gift "Mugen Gacha" de Level 9999 no Nakama-tachi wo Te ni Irete Moto-Party Member to Sekai ni Fukushu and "Zamaa!" shimasu! 10 (KCDX)

[Machine Translation] Suddenly, a report of her younger sister Yume's survival comes in! Light remembers the days when he accumulated his power. From the weakest to the strongest - the long-awaited past chapter of "Nacchan" is about to begin! No.1 in the "Novelist's Narrou" quarterly ranking! (As of July 9, 2020) Light, a boy, is betrayed by his friends and plunged to the bottom of the most dangerous dungeon, "Nadaku". All he has left is his skill "Infinite Gacha", which he thought was garbage! From the worst possible situation, the boy's comeback begins! (*"Novelist Naro" is a registered trademark of Hina Project, Inc.) Zion, who plays with races with his research greed, and Soul Dragon, who devours souls as he pleases. Light crushes these outcasts, who are resting on their own strength, to the point of utter annihilation, and the result is truly a self-inflicted defeat! And just as he is setting his sights on his next goal, he suddenly receives a report that his sister, Yume, is alive! Light remembers the days when he was accumulating his power! The long-awaited past chapter of "Nacchu" is about to begin!

突如舞い込む妹・ユメの生存報告！！　ライトは力を蓄えた日々を追憶する。最弱から最強へ――待望の『奈落』過去編、突入！！！「小説家になろう」四半期ランキング第1位!!!（2020年7月9日時点）仲間に裏切られ、最凶のダンジョン『奈落』の底に突き落とされた少年・ライト。彼に残されたのはゴミだと思われたスキル『無限ガチャ』のみ！　最悪な状況から少年の逆転劇が始まる!!!　（※「小説家になろう」は株式会社ヒナプロジェクトの商標登録です）研究欲のままに人種を弄ぶシオンと、好き放題、魂を貪るソウルドラゴン。己が力にあぐらをかく外道共を、ライトは完膚なきまでに叩き潰し、まさに自業自得の決着を迎える!! そして次なる目標を定めていた時、突如舞い込む妹・ユメの生存報告!? ライトは力を蓄えた日々を追憶する!! 待望の『奈落』過去編、突入!!!